The Impact Of Multimode Fiber Chromatic Dispersion On Data Communications

1990 ◽  
Author(s):  
M. J. Hacker t
Keyword(s):  
Chromatic Dispersion ◽  
Data Communications ◽  
Multimode Fiber ◽  
The Impact

scholarly journals Performance Analysis of Subcarrier Multiplexed Optical Transmission System for QPSK Data

2020 ◽  
Vol 9 (2) ◽  
pp. 466-476
Keyword(s):  
Optical Transmission ◽  
Dispersion Compensation ◽  
Chromatic Dispersion ◽  
Transmission System ◽  
Laser Source ◽  
Radio Link ◽  
Link Distance ◽  
Performance Results ◽  
The Impact ◽  
Dispersion And Attenuation

This paper focuses on the impact of different parameters on the performance of the Subcarrier Multiplexed Optical Transmission System for the application on radio link via optical fiber. Performance results are evaluated for QPSK data format for ODSB and OSSB modulation of Microwave subcarriers with digital NRZ coded random data patterns. The four subsystems of QPSK modulators are at 400, 500, 600, 700 MHz subcarrier frequencies with frequency spacing of 100 MHz. The power of subcarriers is decreasing with increasing the link distance due to dispersion and attenuation. By using dispersion compensation fiber, the link distance has been enhanced from 100 km to 240 km successfully. The impact of chromatic dispersion has been reduced in OSSB by using dual-electrode MZM. The constellation diagram also confirms that the phase of the signal after traveling through the link is changing due to dispersion. The phase is the same for subcarrier 600 MHz & 700 MHz for ODSB and OSSB in QPSK SCM. The impact of linewidth and responsivity on SNR has also analyzed to evaluate the performance. It is concluded that the maximum SNR is decreasing with increase in the linewidth of laser source and increasing with the increase in responsivity of PIN diode for the same fiber length in SCM transmission.

scholarly journals Quantification of the expected residual dispersion of the MICADO Near-IR imaging instrument

2020 ◽  
Vol 496 (4) ◽  
pp. 4266-4275
Author(s):  
J A van den Born ◽  
W Jellema
Keyword(s):  
Near Infrared ◽  
Chromatic Dispersion ◽  
Atmospheric Dispersion ◽  
Atmospheric Conditions ◽  
Near Ir ◽  
Infrared Imager ◽  
Propagation Analysis ◽  
Error Propagation Analysis ◽  
Imaging Instrument ◽  
The Impact

ABSTRACT MICADO, a near-infrared imager for the Extremely Large Telescope, is being designed to deliver diffraction limited imaging and 50 microarcsecond (μas) astrometric accuracy. MICADO employs an atmospheric dispersion corrector (ADC) to keep the chromatic elongation of the point spread function (PSF) under control. We must understand the dispersion and residuals after correction to reach the optimum performance. Therefore, we identified several sources of chromatic dispersion that need to be considered for the MICADO ADC. First, we compared common models of atmospheric dispersion to investigate whether these models remain suitable for MICADO. We showed that the differential dispersion between common atmospheric models and integration over the full atmosphere is less than 10 μas for most observations in H band. We then performed an error propagation analysis to understand the uncertainty in the atmospheric dispersion as a function of atmospheric conditions. In addition, we investigated the impact of photometric colour on the astrometric performance. While the differential refraction between stars within the same field of view can be significant, the inclusion of an ADC rendered this effect negligible. For MICADO specifically, we found that the current optomechanical design dominates the residual dispersion budget of 0.4 milliarcseconds (mas), with a contribution of 0.31 mas due to the positioning accuracy of the prisms and up to 0.15 mas due to a mismatch between the dispersive properties of the glass and the atmosphere. We found no showstoppers in the design of the MICADO ADC for achieving 50 μas relative astrometric accuracy.

n-up 850-nm VCSEL arrays with very low and uniform operation voltage for multimode fiber data communications

1998 ◽  
Author(s):  
H.Q. Hou ◽  
R.P. Schneider ◽  
S.W. Corzine ◽  
B.E. Hammons ◽  
S. Steward
Keyword(s):  
Data Communications ◽  
Multimode Fiber ◽  
Vcsel Arrays

The impact of the off-axis for the spatial light to multimode fiber coupling system

Optik ◽  
2013 ◽  
Vol 124 (24) ◽  
pp. 6803-6805
Author(s):  
Zhihua Luo ◽  
Ping Jiang ◽  
Huajun Yang ◽  
Wensen He ◽  
Hong Zhou ◽  
...  
Keyword(s):  
Multimode Fiber ◽  
Fiber Coupling ◽  
Coupling System ◽  
The Impact

Numerical Analysis of the Performance of Millimeter-Wave RoF-Based Cellular Backhaul Links

2017 ◽  
Vol 38 (3) ◽  
Author(s):  
Thu A. Pham ◽  
Hien T. T. Pham ◽  
Hai-Chau Le ◽  
Ngoc T. Dang
Keyword(s):  
Millimeter Wave ◽  
Optical Fibers ◽  
Nonlinear Distortion ◽  
Chromatic Dispersion ◽  
Mathematic Model ◽  
Multipath Fading ◽  
Hybrid Architecture ◽  
Noise Amplifier ◽  
Performance Setting ◽  
The Impact

AbstractIn this paper, we study the performance of a next-generation cellular backhaul network that is based on a hybrid architecture using radio-over-fiber (RoF) and millimeter-wave (MMW) techniques. We develop a mathematic model and comprehensively analyze the performance of a MMW/RoF-based backhaul downlink under the impacts of various physical layer impairments originated from both optical fiber and wireless links. More specifically, the effects of nonlinear distortion, chromatic dispersion, fading, and many types of noises including shot noise, thermal noise, amplifier noise, and relative intensity noise are investigated. The numerical results show that the nonlinear distortion, fiber dispersion, and wireless fading are key factors that limit the system performance. Setting the modulation index properly helps minimize the effect of nonlinear distortion while implementing dispersion shifted optical fibers could be used to reduce the impact of dispersion and as a result, they can improve the bit-error rate. Moreover, it is also verified that, to mitigate the effect of multipath fading, remote radio heads should be located as near the remote antenna units as possible.

scholarly journals Analysis of Impact of Laser Linewidth and Chromatic Dispersion on Carrier to Noise Ratio in Radio over Fiber

2020 ◽  
Vol 8 (6) ◽  
pp. 3969-3972
Keyword(s):  
Phase Noise ◽  
Line Width ◽  
Chromatic Dispersion ◽  
Radio Over Fiber ◽  
Laser Linewidth ◽  
Noise Ratio ◽  
And Performance ◽  
Set Up ◽  
The Impact

Radio over Fiber is a powerful technology to cater the today’s demands of the customer regarding coverage and capacity. The behaviour and performance of the RoF link is analyzed with MZM external modulator by transmitting ASK data in downlink with the simulation set up on OptiSystem. The impact of chromatic dispersion and laser phase noise due to RF oscillator on Carrier to Noise Ratio (CNR) in radio over fiber systems is studied. The CNR penalty of 3-4 dB is observed for the variation of 10 to 1000MHz Line width of the laser.

Balancing Theoretical and Practical Goals in the Delivery of a University-Level Data Communications Program

2011 ◽  
pp. 290-301
Author(s):  
Jairo Gutierrez ◽  
Koro Tawa
Keyword(s):  
Learning Outcomes ◽  
Learning Process ◽  
Data Communications ◽  
Advantages And Disadvantages ◽  
Level Data ◽  
Hands On ◽  
On Line ◽  
University Level ◽  
The University ◽  
The Impact

This case examines the experience of introducing the Cisco Networking Academy Program as part of two data communications courses taught in the School of Business and Economics at the University of Auckland. This case discusses the advantages and disadvantages encountered in the administration and delivery of the combined (traditional content plus the Cisco-based content) material. The case also analyses the impact of the program on the learning outcomes and objectives of the existing courses. The feedback presented was obtained informally through conversations with students and formally by using end-of-semester surveys and by reviewing students assignments and tests. The case describes how the program combined traditional sage on the stage lectures plus hands-on lab experiments as part of the educational experience. The availability of on-line curricula and testing is also considered as an important element in the learning process.

Sign in / Sign up

Export Citation Format

Share Document